How do I prevent the camera from taking blurred pictures?

To prevent blurred pictures due to camera shake, hold the camera steady by firmly grasping the camera grip with your right hand with both elbows lightly against your body, hold the lens at the bottom with your left hand, press the camera against your face while looking through the viewfinder, place one foot in front of the other for stability, and press the shutter button gently with your finger tip. (Page 14)

From the official Canon Eos Rebel T2 Camera manual, page 14

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